QOJ - QOJ.ac

Announcements
The 2nd Universal Cup Finals Analysis（草稿）	by Qingyu✨	2025-03-03 16:39:06
IOI 2025 China Team Selection Statistics & Prediction by Qingyu	by Qingyu✨	2024-12-04 15:22:03
QOJ Change logs (2025 Mar)	by Qingyu✨	2023-01-06 20:27:29
Judging environment of QOJ (2025 updated)	by Qingyu✨	2021-03-23 20:32:30



All the Announcements……

#	Username	Motto	Solved
1	hos.lyric🐇	$\left[\frac{x^n}{n!} q^{K-1}\right] \frac{(\mathrm{e}^{rx} - 1) (q + r + \mathrm{e}^{rx} + q \mathrm{e}^{rx} - r \mathrm{e}^{rx} + 1)}{(q + 1) (r - \mathrm{e}^{2rx} + r \mathrm{e}^{2rx} + 1)}$	1653
2	xiaowuc1	you're a half a world away, but in my mind I whisper every single word you say	1582
3	Nemesis (Zonghan Yang, Mingchi Zhang, Jianjun Zhang)	Natsuhi Kage (Qiyu Feng, Jianing Liu, Zemu Zhu) Solved: 781; Last Solved at 2025-04-22 16:11:48 (16 hours ago)	1129
4	qiuzx		1087
5	maspy	Universal Cup Upsol部	992
6	larryzhong		981
7	jiangly (Lingyu Jiang)		890
8	Crysfly🌈	$\huge\text{UOJ Round 缺投}$ \|\| www.cnblogs.com/Rainbowsjy	851
9	PetroTarnavskyi	Why haven't you registered at https://algotester.com/en yet? 🤨	806
10	HoMaMaOvO (Riku Kawasaki, Masaki Nishimoto, Yui Hosaka)		794

#	Username	Motto	Authored Problems
1	quailty		106
2	clrs97		84
3	bulijiojiodibuliduo		81
4	TsReaper		80
5	xiaowuc1	you're a half a world away, but in my mind I whisper every single word you say	60
6	ftiasch		46
7	Elegia❄️	$R(T_1\oplus T_2) < R(T_1) + R(T_2)$	43
7	Qingyu✨	我不会忘	43
9	zimpha		42
10	tangjz		39

View all